Tiered WAN services

[xvo]

Yes; currently the routerboard is configured as an AP. I suppose the 2.4Ghz radio could be configured as a station, as a client to the internet WiFi. But then I lose the 2.4 band and have only the 5Ghz for an AP?

Yes. You either configure your 2.4 Ghz/5Ghz band as AP mode or station mode.
It cant be AP and Station at the same time!

That is not true, strictly speaking.
You can create a virtual interface, and have both ap and station on the same physical interface.

http://forum.mikrotik.com/t/sharing-motel-wifi/122496/1